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[209.85.221.53]) by smtp.gmail.com with ESMTPSA id f17-20020a0564021e9100b0042e17781fc5sm2508201edf.49.2022.06.16.12.19.14 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Jun 2022 12:19:14 -0700 (PDT) Received: by mail-wr1-f53.google.com with SMTP id g4so3049609wrh.11 for ; Thu, 16 Jun 2022 12:19:14 -0700 (PDT) X-Received: by 2002:a5d:47aa:0:b0:218:5ac8:f3a8 with SMTP id 10-20020a5d47aa000000b002185ac8f3a8mr6159072wrb.442.1655407153820; Thu, 16 Jun 2022 12:19:13 -0700 (PDT) MIME-Version: 1.0 References: <20220616143617.449094-1-Jason@zx2c4.com> In-Reply-To: From: Linus Torvalds Date: Thu, 16 Jun 2022 12:18:57 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] usercopy: use unsigned long instead of uintptr_t To: Matthew Wilcox Cc: "Jason A. Donenfeld" , Linux-MM , linux-xfs , linux-hardening@vger.kernel.org, Linux Kernel Mailing List , Uladzislau Rezki , Kees Cook , Greg Kroah-Hartman , Joe Perches Content-Type: text/plain; charset="UTF-8" ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1655407157; a=rsa-sha256; cv=none; b=lyme3Scn8fc+a7auZETlFn3UFDeoQoOJ1mHezLSiucpxf9uu/6MLRqKiReFeluak6zQhxK HWCocDyoMjVPENm2GbTDmvUTeQPlF2u96YbGr/2zqJH85e8JGMVk/44TEROgnygLPNAgPn SOcy9BKBYiVMZ1QKzeVwVypAfDlMWro= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=egGfdeT+; dmarc=none; spf=pass (imf25.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.208.53 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1655407157; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=xpcGuEMSHNtJO6AL8yUFZTbd1w1Zp8LDaZt4zG7HQg8=; b=XJaa/y6Khe9enNjXhFoXSaIfZWllyvgFyVDoY4/c97fLngLUYx2HifQIJNuXJtf8dmf0Lt 460Rl2TfjOSM//UT5bGsRmYPkEPwvJnunlEOuIKZBLLBY5B0EyBdK8w5+ZP4Awpyb1Q9xf qHozx82M4xyc199jp208ZNZV3aJqNyo= X-Rspamd-Queue-Id: 0D21EA007C X-Rspam-User: Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=egGfdeT+; dmarc=none; spf=pass (imf25.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.208.53 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org X-Rspamd-Server: rspam06 X-Stat-Signature: uieu8fpuyp94nfrntnjabuc4gku8jfy5 X-HE-Tag: 1655407156-570640 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Jun 16, 2022 at 12:14 PM Linus Torvalds wrote: > > In that situation, we'd probably just see "long long" being 128-bit > ("I32LP64LL128"). Looking around, it looks like people prefer "long long long" (or in the kernel, just "u128") for this, because so many have already gotten used to "long long" being 64-bit, and 32-bit architectures (where "long" is 32-bit and "long long" is 64-bit) are still relevant enough that people want to keep that. Linus